what is the size of printer paper

The most common printer paper size is:

• A4 (international) : 210 × 297 mm, which is about 8.27 × 11.69 inches.

• Letter (mainly U.S./Canada) : 8.5 × 11 inches, which is about 216 × 279 mm.

So, if you’re outside North America, “printer paper size” usually means A4, and in the U.S. or Canada it usually means Letter.